TY  - RPRT
TI  - A penalty approach for nonlinear optimization with discrete design variables
AU  - Shin, Dong K.
AU  - Gurdal, Zafer
AU  - Griffin, O. H., Jr.
PY  - 1989
UR  - https://ntrs.nasa.gov/citations/19890015846
ID  - 19890015846
ER  -